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Insects 2018, 9(1), 21;

Roadside Survey of Ants on Oahu, Hawaii

College of Tropical Agriculture and Human Resources, University of Hawaii at Mānoa, 3050 Maile Way, Gilmore Hall 310, Honolulu, HI 96822, USA
Author to whom correspondence should be addressed.
Received: 12 September 2017 / Revised: 29 January 2018 / Accepted: 6 February 2018 / Published: 11 February 2018
(This article belongs to the Special Issue Urban Pest Management)
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Hawaii is home to over 60 ant species, including five of the six most damaging invasive ants. Although there have been many surveys of ants in Hawaii, the last island-wide hand-collection survey of ants on Oahu was conducted in 1988–1994. In 2012, a timed hand-collection of ants was made at 44 sites in a systematic, roadside survey throughout Oahu. Ants were identified and species distribution in relation to elevation, precipitation and soil type was analyzed. To assess possible convenience sampling bias, 15 additional sites were sampled further from roads to compare with the samples near roads. Twenty-four species of ants were found and mapped; Pheidole megacephala (F.), Ochetellus glaber (Mayr), and Technomyrmex difficilis Forel were the most frequently encountered ants. For six ant species, a logistic regression was performed with elevation, average annual precipitation, and soil order as explanatory variables. O. glaber was found in areas with lower precipitation around Oahu. Paratrechina longicornis (Latrielle) and Tetramorium simillimum (Smith, F.) were found more often in lower elevations and in areas with the Mollisol soil order. Elevation, precipitation, and soil type were not significant sources of variation for P. megacephala, Plagiolepis alluaudi Emery, and T. difficilis. P. megacephala was associated with fewer mean numbers of ants where it occurred. Ant assemblages near and far from roads did not significantly differ. Many species of ants remain established on Oahu, and recent invaders are spreading throughout the island. Mapping ant distributions contributes to continued documentation and understanding of these pests. View Full-Text
Keywords: Formicidae; ant distribution; convenience sampling Formicidae; ant distribution; convenience sampling

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Tong, R.L.; Grace, J.K.; Krushelnycky, P.D.; Spafford, H. Roadside Survey of Ants on Oahu, Hawaii. Insects 2018, 9, 21.

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